﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Example04
{
    class Polygon
    {
        protected 
            int width, height;
        public void setValues (int a, int b)
        { 
            width=a;
            height=b;
        }
    }
    class Rectangle: Polygon 
    {
        public int area ()
        {
           return (width * height);
        }
    }
    class Triangle : Polygon
    {
        public int area()
        {
            return (width * height / 2);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Rectangle rect = new Rectangle ();
            Triangle trgl = new Triangle ();
            rect.setValues (4,5);
            trgl.setValues (4,5);
            Console.WriteLine("rect a:{0}", rect.area());
            Console.WriteLine("trgl b:{0}", trgl.area());
        }
    }
}
